Apparatus for use when paving roads and the like.



W. B. COWELL.

APPARATUS FOR USE WHEN PAVING ROADS AND THE LIKE.

APPLICATION FILED MAR. 15. 1915.

Patented 001. 19, 1915.

O O O O O O 0 d WILLIAM BLACKWELL CO'WELL, 0F CATFORD, ENG-LAND.

APPARATUS FOR USE WHEN PAVING ROADS AND THE LIKE.

when Paving Roads and the like, of which the following is a specification.

One object of this invention is to enable a more uniform heating or drying of the road to be obtained and for this purpose the heater is provided with a diaphragm between the source of heat and the road surface, such diaphragm being made of iron, earthenware, or other material of such a nature and dimensions or weight as'to be capable of absorbing and giving off to the road a considerable amount of heat. phragm may or may not be perforated, but in any event it must not be possible for any flame to come into direct contact with the road.

Another object is to avoid overheating of the material such as asphalt or other fusible material, already placed on the road and which, when melted, is adapted to form a binding material or road surface and moreover, it is essential that the diaphragm should not be injured, coated or clogged by cominginto contact with such road-binding or road surface forming material as that would cause the efliciency of the diaphragm to be impaired and would certainly have the efiect of burning a certain portion of the material referred to.' For these purposes the diaphragm is supported at least a little distance above the loweredge or base of the heater or desiccator.

A further object of the invention is to avoid undue and useless cooling of the heat absorbing and distributing diaphragm, particularly when a perforated diaphragm is used. For this purpose, the box forming the desiccator is made as shallow as possible, so that there shall only be a very limited air space above the heat absorbing diaphragm. In order to allow of the insertion of heaters into the apparatus, the top of the shallow box increases in depth toward the middle, by, for example, making the top in the form of a shallow truncated pyramid; In this way the roof or top of the boxis kept as near as possible to the heat absorbing diaphragm so that the heat in the latter is conserved and canonly be radiated to the road surface and moreover, when oil burners are used, they Specification of Letters Patent.

This dia- Patented Get. 19, 1915.

' Application filed March 15, 1915. Serial No. 14,412.

are so arranged that their flames are caused to play angularly onto the diaphragm and the latter doesnot thus tendto be overheated 1n places, theheat is conserv d and can only be radiated to the road surface,

The invention therefore provides aroad heater or desiccator? comprising a shallow box, having an open bottom, a diaphragm capable of absorbing heat and situated'a little above the basal edges of'the box,\a roof or top, low down over such diaphragm and of a form rising toward the middle to allow for the uniform distribution of a hot blast centrally supplied, or solthat. while allowing for the insertion of heaters such. as blow lamps, the air space above the diaphragm is kept as small as possible.

In order to enable the invention to be readily understood reference is directed to the accompanying drawings in which Figure 1 is a view partly in section and partly in elevation of one construction of desiccator, and, Fig. 2 is a part sectional plan view of such desiccator and, Fig. 3 is a detail view in elevation illustrating a form of removable handle for use in lifting the desiccator. According to the construction shown in Figs-1 and 2, the desiccator consists of an about six feet three inches with a. width of three feet three inches. The sides are suitably about four inches high, but obviously these dimensions may be departed from if desired. This framework a is covered at the sides by sheet iron or the sides may be formed of thin angle iron entirely. Two opposite sides I) andc are suitably connected at the top by a number of parallel pieces 03 of T iron fixed in position with their horizontal members below to form racks to receive a number of unperforated or as'shown, perforated plates e of metal or earthenware which rest on the horizontal flanges of the members 03. Theplates are suitably prevented from falling out in case the desiccator be stoodon end or inverted, by screws,

bolts, clips or in any other convenient manner not shown. The top or roof of the desiccator, which extends to a height of about one foot, is suitably-made to slope downward from the center toward the four sides, or it may be arched, and in the construction shown in the drawings it is covered with sheet iron in the form of more or' less triangular plates f, f, supported by T 11'011 or angle iron members 9 connected or secured at the upper end to a ring, or, as shown, a perforated rectangular plate 72.. plates or covers 7 and also the end plates or covers f if required may be removable in order to allow access to the interior of the desiccator. The top and sides may be lagged with asbestos or other suitable non-conducting material to prevent escapeof heat and a pipe l1; may be passed through the central opening in the plate It into the 1nter1 or of the desiccator for the purpose of adnnttmg hot air or gas. To improve the distribution of the hot air or the like to all parts of the desiccator, the pipe is is closed at the bottom and provided with a number of perforatlons Z, as shown, spaced at suitable distances apart. The pipe is is provided with a umon or coupling m outside of the top of the democator for connection to another pipe or hose n for conveying the hot air or gas to the desiccator. Also, if required, or in addition to the pipe is which in the latter case may be provided with a plug cock or valve, the top of the desiccator may be furnishedwith a door or doors in any'convement posltion to cover the openings or holes for the insertion of a blow-lamp or lamps or the like to-be used instead of a supply of hot air or gas delivered from the outside by the pipe 7:. As shown in Figs. 1 and 2, the blow lamp or lamps 0 may be mounted upon brackets 0 supported outside of the desiccator upon the end plates f and be arranged to deliver in each case a flame or flames into the interior of the desiccator through holes 10 or it may be through nozzles of suitable construction inserted in the holes, and if desired to induce a supply of fresh air sufficient to maintain combustion. Moreover, a supply of air under pressure may also be maintained at the same time through the perforated pipe is. The desiccator is suitably provided with- T iron corner pieces 9, one flange of each of which pieces extends transversely beyond the sides of the desiccator and these flanges are slotted at r so as to allow of the passage of rods 8 for the purpose of lifting the desiccator from place to place, or-the rods 8 maybe reduced at-the ends as shown in Fig.

road foundation, comprising a shallow box inclosed on all sides, having an open bottom, a diaphragm made of a material capable of absorbing and giving off heat and situated a little above the basal edges of the box,-a

roof or'top of a form rising toward the middle to allow for the uniform distribution The side of heat, and means for supplying heat to the interior of the box.

2. An apparatus for drying and heating the surface of, or material laid on, a road or road foundation, comprising a shallow box inclosed on all sides, having an open bottom,

a perforated diaphragm made of a material capable of absorbing and giving off heat and inclosed on all sides, having an open bottom,

aroof or top of a form rising toward the middle to allow for the uniform distribution of heat, means for supplying heat to the in terior of said top, and a diaphragm made of a material capable of absorbing and giving off heat and situated at the junction of the sides of the box and the top.

4. An apparatus for drying and heating the surface of, or material laid on a road or road foundation, comprising a shallow box inclosed on all sides, having an open bottom, a low roof or top of truncated pyramidal form, means for supplying heat to the interior of the said top, and a diaphragm made of a material capable of absorbing and giving off heat and situated at the junction of the sides of the box and the top.

5. An apparatus for drying and heatin the surfaceof, or material laid on a road or road foundation, comprising a shallow box inclosed on all sides, having an open bottom, a low roof or top of truncated pyramidal form, means for supplying heat to the in terior of the said top and a perforated diaphragin made of a material capable of absorbing and giving ofl" heat and situated at the junction of the sides of the box and the top.

6. An apparatus for drying and heating the surface of, or material laid on a road or road foundation, comprising'a shallow box inclosed on all sides, having an open bottom, a low roof or top of truncated pyramidal form, means for supplying heat to the interior of said top, a rack at the junction of the top and sides'and a plurality of plates forming a diaphragm mounted on said rack, said plates consisting of material capable of absorbing and giving off heat, and means for securing said plates to said rack.

7. An apparatus for drying and heating the surface of, or material laid on a road or road "foundation, comprising a shallow box inclosed on all sides, having an open bottom,

a low roof or top of truncated pyramidal form, a plurality of openings in the said top for the insertion of a plurality of blow lamps, aplur-ality ofbrackets adjacent to said openings, each of which brackets is said diaphragm consisting of material capaadapted to serve {as a support for a blovg ble of absorbing and giving off heat. lamp, a pipe in t e top centrally arrange projecting into the top, closed at the bottom WILLIAM BLAGKWELL GOWELL' 5 and laterally perforated for the supply of Witnesses:

hot fiuid to the interior of the top, and a dia- RIPLEY WILsoN, phragm at the junction of the top and sides, H. D. J AMESON. Q 

